[NFCI][lldb][test] Fix mismatched C/C++ substitutions (llvm#165773)

Most of the cases were where a C++ file was being compiled with the C substitution.
There were a few cases of the opposite though.

LLDB seems to be the only real culprit in the LLVM codebase for these mismatches.
Rest of the LLVM presumably sticks at least language-specific options in the common substitutions
making the mistakes immediately apparent.

I found these by using Clang frontend configuration files containing language-specific options for
both C and C++ (e.g. `-std=c2y` and `-std=c++26`).

Author: tambry

lldb/test/API/functionalities/breakpoint/same_cu_name/Makefile

@@ -4,16 +4,16 @@ LD_EXTRAS := ns1.o ns2.o ns3.o ns4.o
 a.out: main.o ns1.o ns2.o ns3.o ns4.o
 
 ns1.o: common.cpp
-	$(CC) -gdwarf -c -DNAMESPACE=ns1 -o $@ $<
+	$(CXX) -gdwarf -c -DNAMESPACE=ns1 -o $@ $<
 
 ns2.o: common.cpp
-	$(CC) -gdwarf -c -DNAMESPACE=ns2 -o $@ $<
+	$(CXX) -gdwarf -c -DNAMESPACE=ns2 -o $@ $<
 
 ns3.o: common.cpp
-	$(CC) -gdwarf -c -DNAMESPACE=ns3 -o $@ $<
+	$(CXX) -gdwarf -c -DNAMESPACE=ns3 -o $@ $<
 
 ns4.o: common.cpp
-	$(CC) -gdwarf -c -DNAMESPACE=ns4 -o $@ $<
+	$(CXX) -gdwarf -c -DNAMESPACE=ns4 -o $@ $<
 
 
 include Makefile.rules

lldb/test/Shell/Breakpoint/jit-loader_jitlink_elf.test

@@ -3,8 +3,8 @@
 
 # JITLink is the Orc-specific JIT linker implementation.
 #
-# RUN: %clang -g -S -emit-llvm -fPIC --target=x86_64-unknown-unknown-elf \
-# RUN:        -o %t.ll %p/Inputs/jitbp.cpp
+# RUN: %clangxx -g -S -emit-llvm -fPIC --target=x86_64-unknown-unknown-elf \
+# RUN:          -o %t.ll %p/Inputs/jitbp.cpp
 # RUN: %lldb -b -o 'settings set plugin.jit-loader.gdb.enable on' -o 'b jitbp' \
 # RUN:          -o 'run --jit-linker=jitlink %t.ll' lli | FileCheck %s
 

lldb/test/Shell/Breakpoint/jit-loader_rtdyld_elf.test

@@ -3,8 +3,8 @@
 
 # RuntimeDyld can be used to link and load emitted code for both, MCJIT and Orc.
 #
-# RUN: %clang -g -S -emit-llvm --target=x86_64-unknown-unknown-elf \
-# RUN:        -o %t.ll %p/Inputs/jitbp.cpp
+# RUN: %clangxx -g -S -emit-llvm --target=x86_64-unknown-unknown-elf \
+# RUN:          -o %t.ll %p/Inputs/jitbp.cpp
 #
 # RUN: %lldb -b -o 'settings set plugin.jit-loader.gdb.enable on' -o 'b jitbp' \
 # RUN:          -o 'run --jit-kind=mcjit %t.ll' lli | FileCheck %s

lldb/test/Shell/Commands/command-image-dump-ast-colored.test

@@ -1,7 +1,7 @@
 # Test AST dumping with and without color.
 
 # RUN: split-file %s %t
-# RUN: %clang_host -g -gdwarf %t/main.cpp -o %t.out
+# RUN: %clangxx_host -g -gdwarf %t/main.cpp -o %t.out
 # RUN: %lldb -x -b -s %t/commands.input %t.out -o exit 2>&1 \
 # RUN:       | FileCheck %s
 

lldb/test/Shell/Commands/command-image-dump-ast.test

@@ -5,7 +5,7 @@
 # UNSUPPORTED: system-windows
 
 # RUN: split-file %s %t
-# RUN: %clang_host -g -gdwarf %t/main.cpp -o %t.out
+# RUN: %clangxx_host -g -gdwarf %t/main.cpp -o %t.out
 # RUN: %lldb -x -b -s %t/commands.input %t.out -o exit 2>&1 \
 # RUN:       | FileCheck %s
 

lldb/test/Shell/Commands/list-header.test

@@ -3,11 +3,11 @@
 # XFAIL: target-windows
 
 ## Test that `list header.h:<line>` works correctly when header is available.
-## 
+##
 # RUN: split-file %s %t
 
-# RUN: %clang_host -g %t/main_with_inlined.cc %t/foo.cc -o %t/main_with_inlined.out
-# RUN: %clang_host -g %t/main_no_inlined.cc %t/foo.cc -o %t/main_no_inlined.out
+# RUN: %clangxx_host -g %t/main_with_inlined.cc %t/foo.cc -o %t/main_with_inlined.out
+# RUN: %clangxx_host -g %t/main_no_inlined.cc %t/foo.cc -o %t/main_no_inlined.out
 
 # RUN: %lldb %t/main_with_inlined.out -o "list foo.h:2" -o "exit" 2>&1 \
 # RUN:   | FileCheck %s --check-prefix=CHECK-INLINED
@@ -19,7 +19,7 @@
 
 # CHECK-INLINED: 2      extern int* ptr;
 # CHECK-INLINED: 3   	void f(int x);
-# CHECK-INLINED: 4   	
+# CHECK-INLINED: 4
 # CHECK-INLINED: 5   	inline void g(int x) {
 # CHECK-INLINED: 6   	  *ptr = x; // should crash here
 # CHECK-INLINED: 7   	}

lldb/test/Shell/Error/cleanup.cpp

@@ -1,5 +1,5 @@
 // Test CommandObject is cleaned up even after commands fail due to not taking any argument.
-// RUN: %clang_host -g %s -o %t
+// RUN: %clangxx_host -g %s -o %t
 // RUN: %lldb -f %t -o "settings set interpreter.stop-command-source-on-error false" -s \
 // RUN:   %S/Inputs/cleanup.lldbinit
 int main() { return 0; }

lldb/test/Shell/Expr/TestExprLanguageNote.test

@@ -1,5 +1,5 @@
 # RUN: split-file %s %t
-# RUN: %clang_host -g %t/main.cpp -o %t.out
+# RUN: %clangxx_host -g %t/main.cpp -o %t.out
 #
 # RUN: %lldb -x -b -o "settings set interpreter.stop-command-source-on-error false" \
 # RUN:       -s %t/no-target.input 2>&1 | FileCheck %s --check-prefix=CHECK-NO-TARGET

lldb/test/Shell/Expr/TestLambdaExprImport.test

@@ -3,7 +3,7 @@
 # uses always).
 
 # RUN: split-file %s %t
-# RUN: %clang_host -g -gdwarf %t/main.cpp -o %t.out
+# RUN: %clangxx_host -g -gdwarf %t/main.cpp -o %t.out
 # RUN: %lldb -o "settings set interpreter.stop-command-source-on-error false" \
 # RUN:       -x -b -s %t/commands.input %t.out 2>&1 \
 # RUN:       | FileCheck %s

lldb/test/Shell/ObjectFile/ELF/elf-memory.test

@@ -11,7 +11,7 @@
 //   - verify that "image dump objfile" will dump the dynamic section of the
 //     memory elf file and find the .dynamic string table.
 
-// RUN: %clang_host %p/Inputs/memory-elf.cpp -g -O0 -o %t
+// RUN: %clangxx_host %p/Inputs/memory-elf.cpp -g -O0 -o %t
 
 // RUN: %lldb %t -b \
 // RUN:   -o "b main" \