Update to clang-r365631b.

Includes the fix for 32-bit x86 with gold, and also the
`-static-openmp` driver option.

Test: ./checkbuild.py && ./run_tests.py
Bug: android/ndk#1028
Bug: android/ndk#1076
Change-Id: Ide30be0e318d861bf8491cae03e3374e1893d2bb

build/tools/prebuilt-common.sh

@@ -1247,7 +1247,7 @@ get_llvm_toolchain_binprefix ()
 {
     local NAME DIR BINPREFIX
     local SYSTEM=${1:-$(get_prebuilt_host_tag)}
-    local VERSION=r365631
+    local VERSION=r365631b
     SYSTEM=${SYSTEM%_64} # Trim _64 suffix. We only have one LLVM.
     BINPREFIX=$ANDROID_BUILD_TOP/prebuilts/clang/host/$SYSTEM/clang-$VERSION/bin
     echo "$BINPREFIX"

docs/changelogs/Changelog-r21.md

@@ -49,6 +49,10 @@ For Android Studio issues, follow the docs on the [Android Studio site].
            Neon to disallow your app from being installed on those devices.
      * [Issue 1004]: Fixed bug with bad line number information when building
        Arm64 with `-O0`.
+     * [Issue 1028]: OpenMP is now available in both static and shared variants.
+       Note that shared is the default behavior, but in prior NDK releases the
+       static library would be used because there was no shared library. To keep
+       the old behavior, link with `-static-openmp`.
  * Updated libc++ to r369764.
  * Updated make to 4.2.1.
      * Modified ndk-build to supply `-O` for more readable errors with parallel
@@ -65,6 +69,7 @@ For Android Studio issues, follow the docs on the [Android Studio site].
    version 3.6 or newer to get the fix.
 
 [Issue 1004]: https://github.com/android-ndk/ndk/issues/1004
+[Issue 1028]: https://github.com/android/ndk/issues/1028
 [Issue 855]: https://github.com/android-ndk/ndk/issues/855
 [Issue 859]: https://github.com/android-ndk/ndk/issues/859
 [Issue 884]: https://github.com/android-ndk/ndk/issues/884

ndk/toolchains.py

@@ -23,7 +23,7 @@
 import ndk.paths
 
 
-CLANG_VERSION = 'clang-r365631'
+CLANG_VERSION = 'clang-r365631b'
 
 
 HOST_TRIPLE_MAP = {