Build with -O3. (#23)

This is needed for PBL to build properly (with expected performance
characteristics): otherwise, inlining of various parts of the
interpreter loop is quite suboptimal, and "always inline" directives are
not followed.

Author: cfallin

build-engine.sh

@@ -23,7 +23,7 @@ ac_add_options --disable-shared-memory
 ac_add_options --disable-tests
 ac_add_options --disable-clang-plugin
 ac_add_options --enable-jitspew
-ac_add_options --enable-optimize
+ac_add_options --enable-optimize=-O3
 ac_add_options --enable-js-streams
 ac_add_options --enable-portable-baseline-interp
 ac_add_options --prefix=${working_dir}/${objdir}/dist

rebuild.sh

@@ -23,7 +23,7 @@ ac_add_options --disable-shared-memory
 ac_add_options --disable-tests
 ac_add_options --disable-clang-plugin
 ac_add_options --enable-jitspew
-ac_add_options --enable-optimize
+ac_add_options --enable-optimize=-O3
 ac_add_options --enable-js-streams
 ac_add_options --enable-portable-baseline-interp
 ac_add_options --prefix=${working_dir}/${objdir}/dist