With the below patch I've been able to build ports gcc 4.9 on:

OpenBSD 6.4-beta (GENERIC) #219: Sat Sep  8 14:02:06 MDT 2018
    dera...@alpha.openbsd.org:/usr/src/sys/arch/alpha/compile/GENERIC
AlphaServer DS10 617 MHz

The patch reduces the optimization level from -O2 to -O1 during the build 
to make things work. With this, I was able to build numpy and run the 
numpy regression tests succesfully.

ok to commit?

(Note: to test you'd also need to add alpha to GCC49_ARCHS in 
infrastructure/mk/arch-defines.mk but that can be committed after the 
below goes in)

Index: Makefile
===================================================================
RCS file: /cvs/ports/lang/gcc/4.9/Makefile,v
retrieving revision 1.57
diff -u -p -u -r1.57 Makefile
--- Makefile    11 Aug 2018 14:11:01 -0000      1.57
+++ Makefile    25 Sep 2018 02:44:34 -0000
@@ -4,7 +4,7 @@ ONLY_FOR_ARCHS = ${GCC49_ARCHS}
 DPB_PROPERTIES = parallel
 
 V = 4.9.4
-REVISION = 11
+REVISION = 12
 FULL_VERSION = $V
 FULL_PKGVERSION = $V
 
@@ -128,7 +128,11 @@ MAKE_ENV += ${EXTRA_ENV}
 
 # Note: the configure target passes CFLAGS to the configure script anyways.
 
+.if ${MACHINE_ARCH} == "alpha"
+CFLAGS = -O1 -g
+.else
 CFLAGS = -O2 -g
+.endif
 
 CONFIGURE_ARGS += \
        --verbose \
@@ -244,6 +248,11 @@ post-extract:
 .if ${BUILD_PACKAGES:M-ada}
        perl -pi -e 's,^#define (_GCOMPILER_LIBCXX_HAVE_GETS) .*,/* #undef $$1 
*/,' \
                ${WRKDIR}/bootstrap/include/c++/*/*/bits/c++config.h
+.endif
+
+post-configure:
+.if ${MACHINE_ARCH} == "alpha"
+       sed -i -e 's,-O2,-O1,g' ${WRKDIR}/build-alpha/Makefile
 .endif
 
 post-install:
Index: pkg/PFRAG.alpha-main
===================================================================
RCS file: pkg/PFRAG.alpha-main
diff -N pkg/PFRAG.alpha-main
--- /dev/null   1 Jan 1970 00:00:00 -0000
+++ pkg/PFRAG.alpha-main        25 Sep 2018 02:44:34 -0000
@@ -0,0 +1,13 @@
+@comment $OpenBSD$
+lib/gcc/${CONFIG}/${V}/include/tgmath.h
+lib/gcc/${CONFIG}/${V}/include/unwind.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/alpha/
+lib/gcc/${CONFIG}/${V}/plugin/include/config/alpha/alpha-protos.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/alpha/alpha.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/alpha/elf.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/alpha/openbsd.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/elfos.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/initfini-array.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/openbsd-libpthread.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/openbsd-stdint.h
+lib/gcc/${CONFIG}/${V}/plugin/include/config/openbsd.h
Index: pkg/PLIST-main
===================================================================
RCS file: /cvs/ports/lang/gcc/4.9/pkg/PLIST-main,v
retrieving revision 1.12
diff -u -p -u -r1.12 PLIST-main
--- pkg/PLIST-main      23 Jul 2018 10:05:35 -0000      1.12
+++ pkg/PLIST-main      25 Sep 2018 02:44:34 -0000
@@ -234,7 +234,7 @@ lib/gcc/${CONFIG}/${V}/plugin/include/va
 lib/gcc/${CONFIG}/${V}/plugin/include/vec.h
 lib/gcc/${CONFIG}/${V}/plugin/include/version.h
 lib/libatomic.a
-@comment %%alpha%%
+%%alpha%%
 %%amd64%%
 %%arm%%
 %%hppa%%

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