[llvm-bugs] [Bug 46301] New: Backport ece79f47083babcabde3700c67b90ef19967a5b3 for 10.0.1

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46301

            Bug ID: 46301
           Summary: Backport ece79f47083babcabde3700c67b90ef19967a5b3 for
                    10.0.1
           Product: libraries
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: tomasz.miasko at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com
            Blocks: 45309

Please cherry-pick https://reviews.llvm.org/D77031 into 10.0.1.
It fixes miscompiation reported in
https://github.com/rust-lang/rust/issues/73151.

```
commit ece79f47083babcabde3700c67b90ef19967a5b3
Author: Yuanfang Chen <yuanfang.chen at sony.com>
Date:   Sun Mar 29 13:01:42 2020 -0700

    [X86] make sure POP has implicit def/use of stack pointer when
materializing 8-bit immediates for minsize
```


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=45309
[Bug 45309] [meta] 10.0.1 Release Blockers
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