[clang] [SystemZ][z/OS] This change adds support for the PPA2 section in zOS (PR #65407)

[Fangrui Song via cfe-commits]

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@@ -0,0 +1,25 @@
+// Please note the following:
+//   + we are checking that the first bytes of the PPA2 are 0x3 0x0
+//     for C, and 0x3 0x1 for C++
+//   + the label for the PPA2 seems to vary on different versions.
+//     We try to cover all cases, and use substitution blocks to
+//     help write the tests. The contents of the PPA2 itself should
+//     not be different.
+//   + the [[:space:]] combines the two .byte lines into one pattern.
+//     This is necessary because if the lines were separated, the first
+//     .byte (i.e., the one for the 3) would, it seems, also match
+//     the .byte line below for the 34.
+
+// RUN: %clang --target=s390x-ibm-zos -xc -S -o - %s | FileCheck %s --check-prefix CHECK-C
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MaskRay wrote:

Use `%clang_cc1` in non-driver tests

https://github.com/llvm/llvm-project/pull/65407