[X86] Multiple use shift amount mask not removed from SHLX

([Zig Godbolt](https://zig.godbo.lt/#g:!((g:!((g:!((h:codeEditor,i:(filename:'1',fontScale:16,fontUsePx:'0',j:1,lang:zig,selection:(endColumn:1,endLineNumber:5,positionColumn:1,positionLineNumber:5,selectionStartColumn:1,selectionStartLineNumber:1,startColumn:1,startLineNumber:1),source:'export+fn+foo(a:+u32,+b:+u32)+u32+%7B%0A++++const+c+%3D+a+%3C%3C+@truncate(b)%3B%0A++++return+c+%5E+(b+%26+31)%3B%0A%7D%0A'),l:'5',n:'0',o:'Zig+source+%231',t:'0')),k:49.9776655687361,l:'4',m:100,n:'0',o:'',s:0,t:'0'),(g:!((g:!((h:compiler,i:(compiler:ztrunk,filters:(b:'0',binary:'1',binaryObject:'1',commentOnly:'0',debugCalls:'1',demangle:'0',directives:'0',execute:'1',intel:'0',libraryCode:'0',trim:'1',verboseDemangling:'0'),flagsViewOpen:'1',fontScale:16,fontUsePx:'0',j:2,lang:zig,libs:!(),options:'-O+ReleaseFast+-target+x86_64-linux+-mcpu%3Dznver5+-fomit-frame-pointer',overrides:!(),selection:(endColumn:18,endLineNumber:7,positionColumn:18,positionLineNumber:7,selectionStartColumn:18,selectionStartLineNumber:7,startColumn:18,startLineNumber:7),source:1),l:'5',n:'0',o:'+zig+trunk+(Editor+%231)',t:'0')),header:(),k:50.022334431263914,l:'4',m:50,n:'0',o:'',s:0,t:'0'),(g:!((h:ir,i:('-fno-discard-value-names':'0',compilerName:'zig+trunk',demangle-symbols:'0',editorid:1,filter-attributes:'0',filter-comments:'0',filter-debug-info:'0',filter-declarations:'1',filter-instruction-metadata:'0',filter-library-functions:'1',fontScale:14,fontUsePx:'0',j:2,selection:(endColumn:1,endLineNumber:10,positionColumn:1,positionLineNumber:10,selectionStartColumn:1,selectionStartLineNumber:1,startColumn:1,startLineNumber:1),show-optimized:'0',treeid:0,wrap:'1'),l:'5',n:'0',o:'LLVM+IR+Viewer+zig+trunk+(Editor+%231,+Compiler+%232)',t:'0')),header:(),l:'4',m:50,n:'0',o:'',s:0,t:'0')),k:50.022334431263914,l:'3',n:'0',o:'',t:'0')),l:'2',m:100,n:'0',o:'',t:'0')),version:4)) ([LLVM Godbolt](https://llvm.godbo.lt/#g:!((g:!((g:!((h:codeEditor,i:(filename:'1',fontScale:14,fontUsePx:'0',j:1,lang:llvm,selection:(endColumn:2,endLineNumber:7,positionColumn:2,positionLineNumber:7,selectionStartColumn:2,selectionStartLineNumber:7,startColumn:2,startLineNumber:7),source:'define+internal+i32+@foo(i32+%250,+i32+%251)+unnamed_addr+align+1+%7B%0AEntry:%0A++%252+%3D+and+i32+%251,+31%0A++%253+%3D+shl+i32+%250,+%252%0A++%254+%3D+xor+i32+%253,+%252%0A++ret+i32+%254%0A%7D'),l:'5',n:'0',o:'LLVM+IR+source+%231',t:'0')),k:53.04858167590479,l:'4',n:'0',o:'',s:0,t:'0'),(g:!((h:compiler,i:(compiler:llctrunk,filters:(b:'0',binary:'1',binaryObject:'1',commentOnly:'0',debugCalls:'1',demangle:'0',directives:'0',execute:'1',intel:'0',libraryCode:'0',trim:'1',verboseDemangling:'0'),flagsViewOpen:'1',fontScale:14,fontUsePx:'0',j:1,lang:llvm,libs:!(),options:'-O3+-mcpu%3Dznver5',overrides:!(),selection:(endColumn:1,endLineNumber:1,positionColumn:1,positionLineNumber:1,selectionStartColumn:1,selectionStartLineNumber:1,startColumn:1,startLineNumber:1),source:1),l:'5',n:'0',o:'+llc+(trunk)+(Editor+%231)',t:'0')),k:46.95141832409521,l:'4',m:100,n:'0',o:'',s:0,t:'0')),l:'2',n:'0',o:'',t:'0')),version:4))
```llvm
define internal i32 @foo(i32 %0, i32 %1) unnamed_addr align 1 {
Entry:
%2 = and i32 %1, 31
%3 = shl i32 %0, %2
%4 = xor i32 %3, %2
ret i32 %4
}
```

Compiles to:

```asm
foo:
and esi, 31
shlx eax, edi, esi
xor eax, esi
ret
```

Should be:

```asm
foo:
shlx eax, edi, esi
and esi, 31
xor eax, esi
ret
```