[lld] [lld] guard allocateAux: only if idx nonzero (PR #149690)

[Fangrui Song via llvm-commits]

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+# REQUIRES: hexagon
+# RUN: rm -rf %t && split-file %s %t && cd %t
+# RUN: llvm-mc -filetype=obj -triple=hexagon-unknown-elf one.s -o one.o
+# RUN: llvm-mc -filetype=obj -triple=hexagon-unknown-elf two.s -o two.o
+# RUN: ld.lld -shared one.o two.o -o %t.so
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MaskRay wrote:

With split-file and cd, we can use `out.so` instead of `%t.so`

https://github.com/llvm/llvm-project/pull/149690