Go patch committed: don't crash on invalid numeric type

[Ian Lance Taylor <iant@golang.org>]

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This patch by Chris Manghane fixes a compiler crash on an invalid
program when the compiler tries to set a numeric constant to an
invalid type.  This fixes https://golang.org/issue/11537.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian

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Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE	(revision 227201)
+++ gcc/go/gofrontend/MERGE	(working copy)
@@ -1,4 +1,4 @@
-d5e6af4e6dd456075a1ec1c03d0dc41cbea5eb36
+cd5362c7bb0b207f484a8dfb8db229fd2bffef09
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: gcc/go/gofrontend/expressions.cc
===================================================================
--- gcc/go/gofrontend/expressions.cc	(revision 227201)
+++ gcc/go/gofrontend/expressions.cc	(working copy)
@@ -15150,7 +15150,11 @@ Numeric_constant::set_type(Type* type, b
   else if (type->complex_type() != NULL)
     ret = this->check_complex_type(type->complex_type(), issue_error, loc);
   else
-    go_unreachable();
+    {
+      ret = false;
+      if (issue_error)
+        go_assert(saw_errors());
+    }
   if (ret)
     this->type_ = type;
   return ret;