Add --enable-overflow-checks-std option to configure script.

Author: hkratz

src/bootstrap/configure.py

@@ -76,6 +76,7 @@ def v(*args):
 o("llvm-plugins", "llvm.plugins", "build LLVM with plugin interface")
 o("debug-assertions", "rust.debug-assertions", "build with debugging assertions")
 o("overflow-checks", "rust.overflow-checks", "build with overflow checks")
+o("overflow-checks-std", "rust.overflow-checks-std", "build the standard library with overflow checks")
 o("llvm-release-debuginfo", "llvm.release-debuginfo", "build LLVM with debugger metadata")
 v("debuginfo-level", "rust.debuginfo-level", "debuginfo level for Rust code")
 v("debuginfo-level-rustc", "rust.debuginfo-level-rustc", "debuginfo level for the compiler")