Filter out unemitted metadata before assertion in AIXAsmPrinter.

Global annotations metadata would trigger an assertion during code
emission on AIX. Filter out globals that are in the "llvm.metadata"
section before reaching the assert. Adds a test to verify the metadata
is not emitted on either ELF or XCOFF targets.

Author: mandlebug

llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -2750,6 +2750,10 @@ void PPCAIXAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
   if (isSpecialLLVMGlobalArrayToSkip(GV) || isSpecialLLVMGlobalArrayForStaticInit(GV))
     return;
 
+  // Ignore non-emitted data.
+  if (GV->getSection() == "llvm.metadata")
+    return;
+
   // If the Global Variable has the toc-data attribute, it needs to be emitted
   // when we emit the .toc section.
   if (GV->hasAttribute("toc-data")) {

llvm/test/CodeGen/PowerPC/annotate-metadata.ll

@@ -0,0 +1,15 @@
+; RUN: llc -verify-machineinstrs -mcpu=pwr8 -mtriple powerpc-ibm-aix-xcoff < \
+; RUN: %s | FileCheck %s
+; RUN: llc -verify-machineinstrs -mcpu=pwr8 -mtriple powerpc64le-unknown-linux < \
+; RUN: %s | FileCheck %s
+
+@.str = private unnamed_addr constant [12 x i8] c"MY_METADATA\00", section "llvm.metadata"
+@.str.1 = private unnamed_addr constant [10 x i8] c"my_file.c\00", section "llvm.metadata"
+@global.annotations = appending global [3 x { ptr, ptr, ptr, i32, ptr }] [{ ptr, ptr, ptr, i32, ptr } { ptr @a, ptr @.str, ptr @.str.1, i32 100, ptr null }, { ptr, ptr, ptr, i32, ptr } { ptr @b, ptr @.str, ptr @.str.1, i32 200, ptr null }, { ptr, ptr, ptr, i32, ptr } { ptr @c, ptr @.str, ptr @.str.1, i32 300, ptr null }], section "llvm.metadata"
+
+@a = global i32 1
+@b = global i32 2
+@c = global i32 3
+
+; CHECK-NOT: metadata
+; CHECK-NOT: annotations