[LLDB][PDB] Run pointers.test with both plugins (llvm#163623)

The `pointers.test` was only run with the DIA plugin. I made the
following changes:

- Remove the check for the function type. 
  The types of the function are different in the plugins:
  ```
  Native:
Type{0x00010084} , size = 0, compiler_type = 0x00000209aff60060 int
(int) __attribute__((thiscall))
  DIA:
Type{0x0000000a} , name = "f", decl = PointerTypeTest.cpp:8,
compiler_type = 0x0000020bc22356c0 int (int) __attribute__((thiscall))
  ```
In DIA, each function gets its own type with a name and decl. In the
native plugin, only one unnamed type is created per signature. This
matches DWARF.
- The check for the `struct ST` fields was split, because the order of
members and methods is swapped between the plugins. In DIA, the member
is first and in the native plugin the method is first. We still check
that both are in the struct.
- The type names for the local variables are different. The native
plugin includes <code>\`extern "C" main'::\`2'::ST</code> which I added
as an allowed prefix. This comes from the mangled name of the struct
`ST` - `.?AUST@?1??main@@9@`.
- The location of local variables is different. DIA creates one static
location (e.g. `DW_OP_breg6 ESI-52`) whereas the native plugin limits
the location to the block (e.g. `[0x0040100d, 0x00401038): DW_OP_breg6
ESI-52`). This gets printed on a second line and the `location` starts
with `0x00000000:`
- DIA adds a decl for each parameter (and local variable). However, this
information is not contained in the PDB. I'm not sure how DIA calculates
this. It's often wrong and assumes variables are declared earlier. For
example, in this test
([PointerTypeTest.cpp](https://github.com/llvm/llvm-project/blob/2b135b931338a57c38d9c4a34ffdd59877ba82d6/lldb/test/Shell/SymbolFile/PDB/Inputs/PointerTypeTest.cpp)),
it assumes that all local variables of `main` are created on line 4. The
native plugin doesn't include this, so I made the check optional.

Author: Nerixyz

lldb/test/Shell/SymbolFile/PDB/pointers.test

@@ -2,38 +2,44 @@ REQUIRES: target-windows, msvc
 RUN: mkdir -p %t.dir
 RUN: %build --compiler=clang-cl --mode=compile --arch=32 --nodefaultlib --output=%t.dir/PointerTypeTest.cpp.obj %S/Inputs/PointerTypeTest.cpp
 RUN: %build --compiler=msvc --mode=link --arch=32 --nodefaultlib --output=%t.dir/PointerTypeTest.cpp.exe %t.dir/PointerTypeTest.cpp.obj
-RUN: lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck %s
-RUN: lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN-ST-F %s
-RUN: lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN-ST %s
-RUN: lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN %s
-RUN: lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=F %s
+
+RUN: env LLDB_USE_NATIVE_PDB_READER=0 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=0 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN-ST-INT %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=0 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN-ST-FN %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=0 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=0 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=F %s
+
+RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN-ST-INT %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN-ST-FN %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=MAIN %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb-test symbols %t.dir/PointerTypeTest.cpp.exe | FileCheck --check-prefix=F %s
 
 CHECK: Module [[MOD:.*]]
 CHECK: {{^[0-9A-F]+}}:   CompileUnit{{[{]0x[0-9a-f]+[}]}}, language = "c++", file = '{{.*}}\PointerTypeTest.cpp'
 
-MAIN-ST-F:  name = "f"
-MAIN-ST-F-SAME: decl = PointerTypeTest.cpp:8
-MAIN-ST-F-SAME: compiler_type = {{.*}} int (int)
+MAIN-ST-INT-LABEL: name = "ST", size = 4, decl = PointerTypeTest.cpp:6, compiler_type = {{.*}} struct ST {
+MAIN-ST-INT: int a;
+MAIN-ST-INT-LABEL:}
 
-MAIN-ST:  name = "ST", size = 4, decl = PointerTypeTest.cpp:6, compiler_type = {{.*}} struct ST {
-MAIN-ST-NEXT: int a;
-MAIN-ST-NEXT: int {{.*}}f(int);
-MAIN-ST-NEXT:}
+MAIN-ST-FN-LABEL:  name = "ST", size = 4, decl = PointerTypeTest.cpp:6, compiler_type = {{.*}} struct ST {
+MAIN-ST-FN: int {{.*}}f(int);
+MAIN-ST-FN-LABEL:}
 
-MAIN:   Function{[[FID1:.*]]}, mangled = {{_?}}main
+MAIN:   Function{[[FID1:.*]]}, {{(de)?}}mangled = {{_?}}main
 MAIN-NEXT:  Block{[[FID1]]}
 MAIN:     Variable{{.*}}, name = "array_pointer"
 MAIN-SAME:    (int (*)[2][4]), scope = local
 MAIN:     Variable{{.*}}, name = "p_int"
 MAIN-SAME:    (int *), scope = local
 MAIN:     Variable{{.*}}, name = "p_member_field"
-MAIN-SAME:    (int ST::*), scope = local
+MAIN-SAME:    (int {{(`extern "C" main'::`2'::)?}}ST::*), scope = local
 MAIN:     Variable{{.*}}, name = "p_member_method"
-MAIN-SAME:    (int (ST::*)(int){{( __attribute__\(\(thiscall\)\))?}}), scope = local
+MAIN-SAME:    (int ({{(`extern "C" main'::`2'::)?}}ST::*)(int){{( __attribute__\(\(thiscall\)\))?}}), scope = local
 
-F:   Function{[[FID2:.*]]}, demangled = {{.*}}f(int)
+F:   Function{[[FID2:.*]]}, demangled = {{.*}}main::ST::f
 F-NEXT:  Block{[[FID2]]}
 F:     Variable{{.*}}, name = "this"
-F-SAME:    (ST *), scope = parameter, location = {{(DW_OP.*)|(<empty>)}}, artificial
+F-SAME:    ({{(`extern "C" main'::`2'::)?}}ST *), scope = parameter, location = {{DW_OP|<empty>|0x00000000}}
 F:     Variable{{.*}}, name = "x"
-F-SAME:    (int), scope = parameter, decl = PointerTypeTest.cpp:8
+F-SAME:    (int), scope = parameter{{(, decl = PointerTypeTest.cpp:8)?}}