[WebAssembly] Fix R_WEBASSEMBLY_FUNCTION_OFFSET_I32 relocation entries

Fixes: lld: warning: unexpected existing value for R_WEBASSEMBLY_FUNCTION_OFFSET_I32: existing=839 expected=838

The existing solution is trying to erroneously recover correct offset of
the function code from the body (which is not a function segment that
includes its size, locals, and code).

The D46763 is trying to maintain the offset of the function code
allowing properly calculate the new relocation entry.

Patch by Yury Delendik

Differential Revision: https://reviews.llvm.org/D46765

llvm-svn: 332412