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[AIX] discard the label in the csect of function description and use qualname…

Authored by DiggerLin on Mar 26 2020, 12:46 PM.

Description

[AIX] discard the label in the csect of function description and use qualname for linkage

SUMMARY:

SUMMARY
for a source file "test.c"

void foo() {};

llc will generate assembly code as (assembly patch)

.globl  foo
.globl  .foo
.csect foo[DS]

foo:

     .long   .foo
     .long   TOC[TC0]
     .long   0

and symbol table as (xcoff object file)
[4]     m   0x00000004     .data     1  unamex                    foo
[5]     a4  0x0000000c       0    0     SD       DS    0    0
[6]     m   0x00000004     .data     1  extern                    foo
[7]     a4  0x00000004       0    0     LD       DS    0    0

After first patch, the assembly will be as

     .globl  foo[DS]                 # -- Begin function foo
     .globl  .foo
     .align  2
     .csect foo[DS]
     .long   .foo
     .long   TOC[TC0]
     .long   0

 and symbol table will as
[6]     m   0x00000004     .data     1  extern                    foo
[7]     a4  0x00000004       0    0     DS      DS    0    0

Change the code for the assembly path and xcoff objectfile patch for llc.

Reviewers: Jason Liu
Subscribers: wuzish, nemanjai, hiraditya

Differential Revision: https://reviews.llvm.org/D76162