[clang] [llvm] [AIX] support builtin_cpu_is() for aix (PR #80069)

[Amy Kwan via llvm-commits]

================
@@ -126,4 +126,53 @@ PPC_LNX_CPU("power10",47)
 #undef PPC_LNX_DEFINE_OFFSETS
 #undef PPC_LNX_FEATURE
 #undef PPC_LNX_CPU
+
+// Definition of the following values are found in the AIX header file: <systemcfg.h>.
+#ifndef AIX_POWERPC_SYS_CONF
+#define AIX_POWERPC_SYS_CONF
----------------
amy-kwan wrote:

Can we be consistent for the indenting here?

https://github.com/llvm/llvm-project/pull/80069