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Rollup merge of #144150 - Gelbpunkt:globalmerge, r=Mark-Simulacrum
tests: assembly: cstring-merging: Disable GlobalMerge pass
The test relies on LLVM not merging all the globals into one and would currently otherwise fail on powerpc64le.
See https://github.com/llvm/llvm-project/blob/release/20.x/llvm/lib/CodeGen/GlobalMerge.cpp and here's the assembly generated prior to disabling the pass:
<details>
<summary>Expand me</summary>
```asm
.abiversion 2
.file "cstring_merging.5aa81ea7b99b31fe-cgu.0"
.section .text.cstr,"ax",``@progbits``
.globl cstr
.p2align 4
.type cstr,``@function``
cstr:
.Lfunc_begin0:
.cfi_startproc
.Lfunc_gep0:
addis 2, 12, .TOC.-.Lfunc_gep0@ha
addi 2, 2, .TOC.-.Lfunc_gep0@l
.Lfunc_lep0:
.localentry cstr, .Lfunc_lep0-.Lfunc_gep0
addis 3, 2, .L_MergedGlobals@toc@ha
li 4, 4
addi 3, 3, .L_MergedGlobals@toc@l
addi 3, 3, 4
blr
.long 0
.quad 0
.Lfunc_end0:
.size cstr, .Lfunc_end0-.Lfunc_begin0
.cfi_endproc
.section .text.manual_cstr,"ax",``@progbits``
.globl manual_cstr
.p2align 4
.type manual_cstr,``@function``
manual_cstr:
.Lfunc_begin1:
.cfi_startproc
.Lfunc_gep1:
addis 2, 12, .TOC.-.Lfunc_gep1@ha
addi 2, 2, .TOC.-.Lfunc_gep1@l
.Lfunc_lep1:
.localentry manual_cstr, .Lfunc_lep1-.Lfunc_gep1
addis 3, 2, .L_MergedGlobals@toc@ha
li 4, 4
addi 3, 3, .L_MergedGlobals@toc@l
addi 3, 3, 8
blr
.long 0
.quad 0
.Lfunc_end1:
.size manual_cstr, .Lfunc_end1-.Lfunc_begin1
.cfi_endproc
.type CSTR,``@object``
.section .data.rel.ro.CSTR,"aw",``@progbits``
.globl CSTR
.p2align 3, 0x0
CSTR:
.quad .L_MergedGlobals
.size CSTR, 8
.type .L_MergedGlobals,``@object``
.section .rodata..L_MergedGlobals,"a",``@progbits``
.L_MergedGlobals:
.asciz "foo"
.asciz "bar"
.asciz "baz"
.size .L_MergedGlobals, 12
.set .Lanon.a643e9a6bba67b7953be2b5f96e0e802.0, .L_MergedGlobals
.size .Lanon.a643e9a6bba67b7953be2b5f96e0e802.0, 4
.set .Lanon.a643e9a6bba67b7953be2b5f96e0e802.1, .L_MergedGlobals+4
.size .Lanon.a643e9a6bba67b7953be2b5f96e0e802.1, 4
.set .Lanon.a643e9a6bba67b7953be2b5f96e0e802.2, .L_MergedGlobals+8
.size .Lanon.a643e9a6bba67b7953be2b5f96e0e802.2, 4
.ident "rustc version 1.90.0-dev"
.section ".note.GNU-stack","",``@progbits``
```
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