[llvm] [clang] [X86] Support CFE flags for APX features (PR #74199)

[Phoebe Wang via cfe-commits]

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@@ -422,3 +422,28 @@
 
 // RUN: touch %t.o
 // RUN: %clang -fdriver-only -Werror --target=x86_64-pc-linux-gnu -mharden-sls=all %t.o -o /dev/null 2>&1 | count 0
+// RUN: %clang -target x86_64-unknown-linux-gnu -mapxf %s -### -o %t.o 2>&1 | FileCheck -check-prefix=APXF %s
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phoebewang wrote:

Missing tests for macro defines

https://github.com/llvm/llvm-project/pull/74199