Auto merge of rust-lang#90175 - cuviper:min-llvm-12, r=nagisa

Update the minimum external LLVM to 12

With this change, we'll have stable support for LLVM 12 and 13.
For reference, the previous increase to LLVM 10 was rust-lang#83387,
and this replaces the pending increase to LLVM 11 in rust-lang#90062.

r? `@nagisa` `@nikic`

Author: bors

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
           - name: mingw-check
             os: ubuntu-latest-xl
             env: {}
-          - name: x86_64-gnu-llvm-10
+          - name: x86_64-gnu-llvm-12
             os: ubuntu-latest-xl
             env: {}
           - name: x86_64-gnu-tools
@@ -274,7 +274,7 @@ jobs:
           - name: x86_64-gnu-distcheck
             os: ubuntu-latest-xl
             env: {}
-          - name: x86_64-gnu-llvm-10
+          - name: x86_64-gnu-llvm-12
             env:
               RUST_BACKTRACE: 1
             os: ubuntu-latest-xl

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -95,8 +95,7 @@ unsafe fn configure_llvm(sess: &Session) {
         // Ref:
         // - https://github.com/rust-lang/rust/issues/85351
         // - https://reviews.llvm.org/D103167
-        let llvm_version = llvm_util::get_version();
-        if llvm_version >= (11, 0, 0) && llvm_version < (13, 0, 0) {
+        if llvm_util::get_version() < (13, 0, 0) {
             add("-enable-machine-outliner=never", false);
         }