x86_32, arm32:

/pool/buildbot/slaves/sobornost/jdkX/build/src/hotspot/share/gc/shared/c2/barrierSetC2.cpp:722:28: error: expected type-specifier before 'ConvI2LNode'
     Node* alloc_size = new ConvI2LNode(size_in_bytes);
                            ^~~~~~~~~~~

Seems to be a missing include. After adding the missing include, starts to fail with:

/home/shade/jdk-jdk/src/hotspot/share/opto/macro.cpp: In member function ‘Node* PhaseMacroExpand::prefetch_allocation(Node*, Node*&, Node*&, Node*, Node*, intx)’:
/home/shade/jdk-jdk/src/hotspot/share/opto/macro.cpp:1730:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
       for ( uint i = 0; i < lines; i++ ) {
                         ~~^~~~~~~
/home/shade/jdk-jdk/src/hotspot/share/opto/macro.cpp:1783:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
       for ( uint i = 1; i < lines; i++ ) {
                         ~~^~~~~~~
/home/shade/jdk-jdk/src/hotspot/share/opto/macro.cpp:1799:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
       for ( uint i = 0; i < lines; i++ ) {
                         ~~^~~~~~~