[lld] [lld][LoongArch] Support the R_LARCH_{ADD,SUB}_ULEB128 relocation types (PR #81133)

[Fangrui Song via llvm-commits]

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+# REQUIRES: loongarch
+# RUN: rm -rf %t && split-file %s %t && cd %t
+
+# RUN: llvm-mc --filetype=obj --triple=loongarch64 --mattr=+relax a.s -o a.o
+# RUN: llvm-readobj -r -x .gcc_except_table -x .debug_rnglists -x .debug_loclists a.o | FileCheck %s --check-prefix=REL
+# RUN: ld.lld -shared --gc-sections a.o -o a.so
+# RUN: llvm-readelf -x .gcc_except_table -x .debug_rnglists -x .debug_loclists a.so | FileCheck %s
+
+# RUN: llvm-mc --filetype=obj --triple=loongarch32 --mattr=+relax extraspace.s -o extraspace32.o
+# RUN: llvm-mc --filetype=obj --triple=loongarch64 --mattr=+relax extraspace.s -o extraspace64.o --defsym=size64=1
+# RUN: not ld.lld -shared extraspace32.o 2>&1 | FileCheck %s --check-prefix=ERROR
+# RUN: not ld.lld -shared extraspace64.o 2>&1 | FileCheck %s --check-prefix=ERROR
+# ERROR: error: {{.*}}.o:(.rodata+0x0): extra space for uleb128
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MaskRay wrote:

a.o since the filename is determined

https://github.com/llvm/llvm-project/pull/81133