Disable JS Helper threads on ppc64le

https://bugzilla.redhat.com/show_bug.cgi?id=1523121

disable-extra-threads.patch

@@ -0,0 +1,21 @@
+diff -up firefox-52.6.0esr/js/src/vm/Runtime.cpp.disable-extra-threads firefox-52.6.0esr/js/src/vm/Runtime.cpp
+--- firefox-52.6.0esr/js/src/vm/Runtime.cpp.disable-extra-threads	2018-02-08 10:16:13.453828939 -0500
++++ firefox-52.6.0esr/js/src/vm/Runtime.cpp	2018-02-08 10:23:31.283458826 -0500
+@@ -283,6 +283,17 @@ JSRuntime::init(uint32_t maxbytes, uint3
+     ownerThreadNative_ = (size_t)pthread_self();
+ #endif
+ 
++    const char* enable_js_helper_threads;
++    enable_js_helper_threads = getenv("GJS_ENABLE_JS_HELPER_THREADS");
++
++#if defined(__PPC64__) && defined (__LITTLE_ENDIAN__)
++    if (enable_js_helper_threads == NULL)
++        js::DisableExtraThreads();
++#endif
++
++    if (enable_js_helper_threads != NULL && enable_js_helper_threads[0] == '0')
++        js::DisableExtraThreads();
++
+     if (!mainThread.init())
+         return false;
+ 

mozjs52.spec

@@ -23,6 +23,10 @@ Source0:        https://ftp.mozilla.org/pub/firefox/releases/%{version}esr/sourc
 Patch0001:      fix-soname.patch
 Patch0002:      copy-headers.patch
 
+# Disable JS Helper threads on ppc64le
+# https://bugzilla.redhat.com/show_bug.cgi?id=1523121
+Patch0003:      disable-extra-threads.patch
+
 # Patches from https://github.com/ptomato/mozjs / Debian mozjs52_52.3.1-4.debian.tar.xz
 Patch0101:      disable-mozglue.patch
 Patch0104:      include-configure-script.patch
@@ -67,6 +71,7 @@ developing applications that use %{name}.
 pushd ../..
 %patch0001 -p1
 %patch0002 -p1
+%patch0003 -p1
 
 %patch0101 -p1
 %patch0104 -p1
@@ -172,6 +177,7 @@ ln -s libmozjs-%{major}.so.0 %{buildroot}%{_libdir}/libmozjs-%{major}.so
 * Fri May 11 2018 Kalev Lember <klember@redhat.com> - 52.8.0-1
 - Update to 52.8.0
 - Fix the build on ppc
+- Disable JS Helper threads on ppc64le (#1523121)
 
 * Sat Apr 07 2018 Kalev Lember <klember@redhat.com> - 52.7.3-1
 - Update to 52.7.3