Merge changes from topic "use-rust-1.51.0"

* changes:
  Update Rust sysroots
  rustc-1.51.0 Build 7245052

Author: jeffvanderstoep

Android.bp

@@ -37,7 +37,7 @@ license {
     // large-scale-change unable to identify any license_text files
 }
 
-rustc = "linux-x86/1.50.0/src/stdlibs"
+rustc = "linux-x86/1.51.0/src/stdlibs"
 
 // The basic crates are only available as static libraries
 // .rust_sysroot is appended to the name to prevent accidental direct usage
@@ -84,6 +84,7 @@ rust_library_rlib {
         "compiler_builtins",
     ],
     rlibs: [
+        "liballoc.rust_sysroot",
         "libcompiler_builtins.rust_sysroot",
         "libcore.rust_sysroot",
         "liblibc.rust_sysroot",

darwin-x86/1.51.0/bin/cargo

@@ -0,0 +1,24 @@
+#!/bin/sh
+# Exit if anything fails
+set -e
+
+# Prefer rustc in the same directory as this script
+DIR="$(dirname "$0")"
+if [ -x "$DIR/rustc" ]; then
+  RUSTC="$DIR/rustc"
+else
+  RUSTC="rustc"
+fi
+
+# Find out where the pretty printer Python module is
+RUSTC_SYSROOT="$("$RUSTC" --print=sysroot)"
+GDB_PYTHON_MODULE_DIRECTORY="$RUSTC_SYSROOT/lib/rustlib/etc"
+
+# Run GDB with the additional arguments that load the pretty printers
+# Set the environment variable `RUST_GDB` to overwrite the call to a
+# different/specific command (defaults to `gdb`).
+RUST_GDB="${RUST_GDB:-gdb}"
+PYTHONPATH="$PYTHONPATH:$GDB_PYTHON_MODULE_DIRECTORY" exec ${RUST_GDB} \
+  --directory="$GDB_PYTHON_MODULE_DIRECTORY" \
+  -iex "add-auto-load-safe-path $GDB_PYTHON_MODULE_DIRECTORY" \
+  "$@"