[lldb][test] Run calling-conventions-arm.test with native PDB reader as well (#152670)

And actually check the arm32 output. Lucky for us, it does work.

Separated the lines a bit too so they are easier to read.

Follow up to llvm/llvm-project#152580.

Author: DavidSpickett

lldb/test/Shell/SymbolFile/PDB/calling-conventions-arm.test

@@ -1,7 +1,12 @@
 REQUIRES: target-windows, lld, (target-arm || target-aarch64)
+
 RUN: %build --compiler=clang-cl --arch=32 --nodefaultlib --output=%t.exe %S/Inputs/CallingConventionsTest.cpp
+RUN: lldb-test symbols -dump-ast %t.exe | FileCheck %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb-test symbols -dump-ast %t.exe | FileCheck %s
+
 RUN: %build --compiler=clang-cl --arch=64 --nodefaultlib --output=%t.exe %S/Inputs/CallingConventionsTest.cpp
 RUN: lldb-test symbols -dump-ast %t.exe | FileCheck %s
+RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb-test symbols -dump-ast %t.exe | FileCheck %s
 
 CHECK: Module: {{.*}}
 CHECK-DAG: int (*FuncCCallPtr)();