Most of the patches are copied over from GCC 8.3.

The following patches are backported from the GCC 9.X development branch:
toolchain/gcc/patches/9.1.0/970-recompute-dom-fast-queries-before-vn.patch
toolchain/gcc/patches/9.1.0/975-g++-ICE-with-generic-lambda.patch

The specs file changed with gcc 9, now it contains "%@{L*}" instead of
"%{L*}" in older GCC versions.

Signed-off-by: Joseph Benden <joe@benden.us>

SVN-Revision: 29948

patch-specs.sh: fallback to ext-toolchain.sh --wrap if spec file patching is not possible (gcc < 4.3.0)

SVN-Revision: 29945

add patch-specs.sh, a utility for modifying GCC specs The patch-specs.sh utility dumps the GCC specs of a given toolchain and modifies them to always include $STAGING_DIR in the link and compiler command lines, this makes most -I and -L flags unnecessary and lets the compiler automatically find libraries and headers in the staging dir, also solves the majority of -rpath issues.

SVN-Revision: 29767