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[WebAssembly] Add more test coverage for reloctions against section symbols

Description

[WebAssembly] Add more test coverage for reloctions against section symbols

The only known user of this relocation type and symbol type is
the debug info sections, but we were not testing the --relocatable
output path.

This change adds a minimal test case to cover relocations against
section symbols includes --relocatable output.

Differential Revision: https://reviews.llvm.org/D61623