Auto merge of #137959 - matthiaskrgr:rollup-62vjvwr, r=matthiaskrgr

Rollup of 12 pull requests

Successful merges:

 - #135767 (Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies)
 - #137852 (Remove layouting dead code for non-array SIMD types.)
 - #137863 (Fix pretty printing of unsafe binders)
 - #137882 (do not build additional stage on compiler paths)
 - #137894 (Revert "store ScalarPair via memset when one side is undef and the other side can be memset")
 - #137902 (Make `ast::TokenKind` more like `lexer::TokenKind`)
 - #137921 (Subtree update of `rust-analyzer`)
 - #137922 (A few cleanups after the removal of `cfg(not(parallel))`)
 - #137939 (fix order on shl impl)
 - #137946 (Fix docker run-local docs)
 - #137955 (Always allow rustdoc-json tests to contain long lines)
 - #137958 (triagebot.toml: Don't label `test/rustdoc-json` as A-rustdoc-search)

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_codegen_llvm/src/common.rs

@@ -127,10 +127,6 @@ impl<'ll, 'tcx> ConstCodegenMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         unsafe { llvm::LLVMGetUndef(t) }
     }
 
-    fn is_undef(&self, v: &'ll Value) -> bool {
-        unsafe { llvm::LLVMIsUndef(v) == True }
-    }
-
     fn const_poison(&self, t: &'ll Type) -> &'ll Value {
         unsafe { llvm::LLVMGetPoison(t) }
     }