push OFFSET symbol generates wrong code for Intel syntax on i686

[lhmouse]

https://godbolt.org/z/vfE68E3c9

; .att_syntax
; pushl $_foo

.intel_syntax noprefix
push OFFSET _foo

This generates a 16-bit push for i686-pc-linux and causes an error for i686-w64-mingw32:

<source>:5:1: error: unsupported relocation type
push OFFSET _foo

Expected behavior is that it should generate a 32-bit push that references _foo as an absolute address.

x86-64 is not affected.

[llvmbot]

@llvm/issue-subscribers-backend-x86

Author: LIU Hao (lhmouse)

https://godbolt.org/z/vfE68E3c9 ```asm ; .att_syntax ; pushl $_foo

.intel_syntax noprefix
push OFFSET _foo

This generates a 16-bit push for i686-pc-linux and causes an error for i686-w64-mingw32:

> \<source\>:5:1: error: unsupported relocation type
> push OFFSET _foo

Expected behavior is that it should generate a 32-bit push that references `_foo` as an absolute address.

x86-64 is not affected.

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