Remove Iceland.

ART_USE_LLVM_COMPILER is removed and when necessary ART_USE_PORTABLE_COMPILER
is used in #ifdefs.

Change-Id: Iffa9ce5b0246c7c427ccc4e67ecc134624632e55
diff --git a/src/oat.cc b/src/oat.cc
index 79a16cf..145abc6 100644
--- a/src/oat.cc
+++ b/src/oat.cc
@@ -147,7 +147,7 @@
     vmap_table_offset_(0),
     gc_map_offset_(0),
     invoke_stub_offset_(0)
-#if defined(ART_USE_LLVM_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   , proxy_stub_offset_(0)
 #endif
 {}
@@ -160,7 +160,7 @@
                                    uint32_t vmap_table_offset,
                                    uint32_t gc_map_offset,
                                    uint32_t invoke_stub_offset
-#if defined(ART_USE_LLVM_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
                                  , uint32_t proxy_stub_offset
 #endif
                                    )
@@ -172,7 +172,7 @@
     vmap_table_offset_(vmap_table_offset),
     gc_map_offset_(gc_map_offset),
     invoke_stub_offset_(invoke_stub_offset)
-#if defined(ART_USE_LLVM_COMPILER)
+#if defined(ART_USE_PORTABLE_COMPILER)
   , proxy_stub_offset_(proxy_stub_offset)
 #endif
 {}