gcc-7.3: Fix build on ppc64le hosts

When building on ppc64le hosts that have GCC 8 (such as Ubuntu 18.10)
the GCC build bootstrap fails. This is a patch from the gcc-7 branch
that resolves the issue.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86162

Change-Id: I7796d2a999ec420805dd1c6cf0a1ecba1de5a897
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/import-layers/yocto-poky/meta/recipes-devtools/gcc/gcc-7.3.inc b/import-layers/yocto-poky/meta/recipes-devtools/gcc/gcc-7.3.inc
index 8a66e83..6dff694 100644
--- a/import-layers/yocto-poky/meta/recipes-devtools/gcc/gcc-7.3.inc
+++ b/import-layers/yocto-poky/meta/recipes-devtools/gcc/gcc-7.3.inc
@@ -80,6 +80,7 @@
            file://0001-Fix-internal-compiler-error-in-testcase.patch \
            file://0001-PR-rtl-optimization-83030.patch \
            file://0001-PR-c-80290-memory-hog-with-std-pair.patch \
+           file://0001-Fix-ppc64le-build-Partial-backport-r256656.patch \
 "
 
 SRC_URI[md5sum] = "be2da21680f27624f3a87055c4ba5af2"