Switch the loader to a noexcept version of libc++

The current external/libcxx uses the pthreads API to access EH globals,
which is unlikely to work in the loader. The new libc++ prebuilt uses
ELF TLS, which also doesn't work in the loader and crashes the arm64
loader on startup.

Bug: http://b/332594828
Test: treehugger
Change-Id: Icf40085d78cbaba751a97a1d457cb6cc7af7e065
diff --git a/linker/Android.bp b/linker/Android.bp
index e1a5a91..1ede380 100644
--- a/linker/Android.bp
+++ b/linker/Android.bp
@@ -367,7 +367,9 @@
         "liblinker_main",
         "liblinker_malloc",
 
-        "libc++_static",
+        // Use a version of libc++ built without exceptions, because accessing EH globals uses
+        // ELF TLS, which is not supported in the loader.
+        "libc++_static_noexcept",
         "libc_nomalloc",
         "libc_dynamic_dispatch",
         "libm",
@@ -434,7 +436,7 @@
                 "linker_debuggerd_android.cpp",
             ],
             static_libs: [
-                "libc++demangle",
+                "libc++demangle_noexcept",
                 "libdebuggerd_handler_fallback",
             ],
         },