[llvm] [PowerPC][AIX] support explicit sections for -ffunction-sections (PR #85351)

[Hubert Tong via llvm-commits]

================
@@ -0,0 +1,142 @@
+; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc-ibm-aix-xcoff \
+; RUN:     -xcoff-traceback-table=false -filetype=obj -function-sections -o %t.o < %s
+; RUN: llvm-readobj -s %t.o | FileCheck %s
+
+define dso_local signext i32 @foo1() section "sect" {
+entry:
+  ret i32 1
+}
+
+define dso_local signext i32 @foo2() section "sect2" {
+entry:
+  ret i32 2
+}
+
+define dso_local signext i32 @foo3()  section "sect2" {
+entry:
+  ret i32 3
+}
+
+define dso_local signext i32 @foo4() {
+entry:
+  ret i32 4
+}
+
+; CHECK:       Symbol {{[{][[:space:]] *}}Index: [[#INDX:]]{{[[:space:]] *}}Name: sect
+; CHECK-NEXT:    Value (RelocatableAddress): 0x0
+; CHECK-NEXT:    Section: .text
+; CHECK-NEXT:    Type: 0x0
+; CHECK-NEXT:    StorageClass: C_HIDEXT (0x6B)
+; CHECK-NEXT:    NumberOfAuxEntries: 1
+; CHECK-NEXT:    CSECT Auxiliary Entry {
+; CHECK-NEXT:      Index: [[#INDX+1]]
+; CHECK-NEXT:      SectionLen: 8
+; CHECK-NEXT:      ParameterHashIndex: 0x0
+; CHECK-NEXT:      TypeChkSectNum: 0x0
+; CHECK-NEXT:      SymbolAlignmentLog2: 5
+; CHECK-NEXT:      SymbolType: XTY_SD (0x1)
+; CHECK-NEXT:      StorageMappingClass: XMC_PR (0x0)
+; CHECK-NEXT:      StabInfoIndex: 0x0
+; CHECK-NEXT:      StabSectNum: 0x0
+; CHECK-NEXT:    }
+; CHECK-NEXT:  }
+; CHECK-NEXT:  Symbol {
+; CHECK-NEXT:    Index: [[#INDX+2]]
+; CHECK-NEXT:    Name: .foo1
+; CHECK-NEXT:    Value (RelocatableAddress): 0x0
+; CHECK-NEXT:    Section: .text
+; CHECK-NEXT:    Type: 0x0
+; CHECK-NEXT:    StorageClass: C_EXT (0x2)
+; CHECK-NEXT:    NumberOfAuxEntries: 1
+; CHECK-NEXT:    CSECT Auxiliary Entry {
+; CHECK-NEXT:      Index:  [[#INDX+3]]
+; CHECK-NEXT:      ContainingCsectSymbolIndex: [[#INDX]]
+; CHECK-NEXT:      ParameterHashIndex: 0x0
+; CHECK-NEXT:      TypeChkSectNum: 0x0
+; CHECK-NEXT:      SymbolAlignmentLog2: 0
+; CHECK-NEXT:      SymbolType: XTY_LD (0x2
----------------
hubert-reinterpretcast wrote:

```suggestion
; CHECK-NEXT:      SymbolType: XTY_LD (0x2)
```

https://github.com/llvm/llvm-project/pull/85351