Add test case with multiple target-cpu

Author: amy-kwan

llvm/test/CodeGen/PowerPC/aix-cpu-version-multifunction.ll

@@ -0,0 +1,29 @@
+; RUN: llc -verify-machineinstrs -mtriple powerpc64-ibm-aix-xcoff  < %s | FileCheck %s
+
+; For the .machine directive emitted on AIX, the "target-cpu" attribute that is
+; the newest will be used as the CPU for the module (in this case, PWR10).
+
+; CHECK:      .file "file.c"
+; CHECK-NEXT: .csect ..text..[PR],5
+; CHECK-NEXT: .rename ..text..[PR],""
+; CHECK-NEXT: .machine "PWR10"
+
+source_filename = "file.c"
+
+define dso_local signext i32 @testFunc1() #0 {
+entry:
+  %retval = alloca i32, align 4
+  store i32 0, ptr %retval, align 4
+  ret i32 0
+}
+
+define dso_local signext i32 @testFunc2() #1 {
+entry:
+  %retval = alloca i32, align 4
+  store i32 0, ptr %retval, align 4
+  ret i32 0
+}
+
+attributes #0 = { "target-cpu" = "pwr8" }
+attributes #1 = { "target-cpu" = "pwr10" }
+