[Github] Bump CI container to LLVM 20.1.1

This patch bumps the CI container to the latest LLVM Release and gets rid of
the patch that we were carrying that is in 20.1.1.

Pull Request: llvm#132567

Author: boomanaiden154

.github/workflows/containers/github-action-ci/Dockerfile

@@ -2,7 +2,7 @@ FROM docker.io/library/ubuntu:22.04 as base
 ENV LLVM_SYSROOT=/opt/llvm
 
 FROM base as stage1-toolchain
-ENV LLVM_VERSION=19.1.5
+ENV LLVM_VERSION=20.1.1
 
 RUN apt-get update && \
     apt-get install -y \
@@ -20,12 +20,6 @@ RUN curl -O -L https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-$L
 
 WORKDIR /llvm-project-llvmorg-$LLVM_VERSION
 
-# Patch to enable better PGO profile data.
-# TODO: Remove this for llvm 20
-ADD https://github.com/llvm/llvm-project/commit/738250989ce516f02f809bdfde474a039c77e81f.patch .
-
-RUN patch -p1 < 738250989ce516f02f809bdfde474a039c77e81f.patch
-
 RUN cmake -B ./build -G Ninja ./llvm \
   -C ./clang/cmake/caches/BOLT-PGO.cmake \
   -DBOOTSTRAP_LLVM_ENABLE_LLD=ON \