Rollup merge of #50514 - alexcrichton:update-llvm, r=kennytm
Rollup merge of #50514 - alexcrichton:update-llvm, r=kennytm

Pull in a wasm fix from LLVM upstream

This pulls in a fix for https://bugs.llvm.org/show_bug.cgi?id=36564 which has
already landed in upstream LLVM and should...

Closes rust-lang-nursery/rust-wasm#168

graydon/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust