fixup tests, NFCI

* for pp-trace tests:
It no longer emits
```
  -  MacroNameTok: __GCC_HAVE_DWARF2_CFI_ASM
  -  MacroDirective: MD_Define
  -- Callback: MacroDefined
```
so remove the FileCheck boundaries accounting for it.

* for DebugInfo/KeyInstructions/flag.cpp:
 The macro has alwayd been set, but the test passed because of case
sentitivity, instead allow the direct flag.

Author: cyndyishida

clang-tools-extra/test/pp-trace/pp-trace-include.cpp

@@ -39,7 +39,6 @@
 // CHECK-NEXT:   Reason: EnterFile
 // CHECK-NEXT:   FileType: C_User
 // CHECK-NEXT:   PrevFID: (invalid)
-// CHECK:      - Callback: MacroDefined
 // CHECK:      - Callback: FileChanged
 // CHECK-NEXT:   Loc: "<built-in>:1:1"
 // CHECK-NEXT:   Reason: ExitFile

clang-tools-extra/test/pp-trace/pp-trace-macro.cpp

@@ -40,7 +40,6 @@ X
 // CHECK-NEXT:   MacroNameTok: __STDC_EMBED_EMPTY__
 // CHECK-NEXT:   MacroDirective: MD_Define
 // CHECK:      - Callback: MacroDefined
-// CHECK:      - Callback: MacroDefined
 // CHECK-NEXT:   MacroNameTok: MACRO
 // CHECK-NEXT:   MacroDirective: MD_Define
 // CHECK-NEXT: - Callback: MacroExpands

clang/test/DebugInfo/KeyInstructions/flag.cpp

@@ -8,6 +8,9 @@
 
 // KEY-INSTRUCTIONS: "-gkey-instructions"
 // NO-KEY-INSTRUCTIONS-NOT: key-instructions
+
+// Only expect one dwarf related flag.
+// NO-DEBUG: -fdwarf2-cfi-asm
 // NO-DEBUG-NOT: debug-info-kind
 // NO-DEBUG-NOT: dwarf