[GR-28684] Update LLVM to version 12.0.1.

PullRequest: graal/9656

common.json

@@ -26,12 +26,18 @@
       "windows-jdk17":      { "packages" : { "devkit:VS2019-16.9.3+1"  : "==0" }}
   },
   "deps": {
+    "COMMENT.common": [
+      "pip:isort is a dependency of pip:pylint. The explicit dependency on the pip package works around",
+      "https://bugzilla.redhat.com/show_bug.cgi?id=1710221 on older Redhat-based systems, and doesn't",
+      "hurt on others."
+    ],
     "common": {
       "timelimit": "30:00",
       "environment": {
         "MX_PYTHON": "python3"
       },
       "packages": {
+        "pip:isort": "==4.3.19",
         "pip:logilab-common": "==1.4.4",
         "pip:pylint": "==1.9.3",
         "pip:ninja_syntax": "==1.7.2"

docs/reference-manual/llvm/Compatibility.md

@@ -6,7 +6,7 @@ permalink: /reference-manual/llvm/Compatibility/
 ---
 # LLVM Compatibility
 
-GraalVM supports LLVM bitcode versions 3.8 to 10.0.
+GraalVM supports LLVM bitcode versions 4.0 to 12.0.1.
 It is recommended to use the LLVM toolchain shipped with GraalVM.
 
 ## Optimizations Flags

sdk/llvm-patches/README.md

@@ -3,5 +3,5 @@ LLVM Upstream Patches
 
 This directory contains patches which were used to build this
 LLVM distribution but are not yet upstream or have been backported
-to LLVM 10. To build this LLVM distribution yourself, apply the patches
-on top of an LLVM [10.0.0](https://github.com/llvm/llvm-project/tree/llvmorg-10.0.0) source tree.
+to LLVM 12. To build this LLVM distribution yourself, apply the patches
+on top of an LLVM [12.0.1](https://github.com/llvm/llvm-project/tree/llvmorg-12.0.1) source tree.