[WebAssembly] Don't override default implementation of isOffsetFoldingLegal. NFC.
The default implementation does we want and is going to more compatible
with dynamic linking (-fPIC) support that is planned.
This is NFC because currently we only build wasm with
`-relocation-model=static` which in turn means that the default
`isOffsetFoldingLegal` always returns true today.
Differential Revision: https://reviews.llvm.org/D54661
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356410
91177308-0d34-0410-b5e6-
96231b3b80d8
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