Move block_annotate from iomgr to support since it's used in other
core places besides iomgr
diff --git a/gRPC.podspec b/gRPC.podspec
index 38d6b28..a8d586f 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -61,7 +61,8 @@
 
   # Core cross-platform gRPC library, written in C.
   s.subspec 'C-Core' do |ss|
-    ss.source_files = 'src/core/support/env.h',
+    ss.source_files = 'src/core/support/block_annotate.h',
+                      'src/core/support/env.h',
                       'src/core/support/file.h',
                       'src/core/support/murmur_hash.h',
                       'src/core/support/stack_lockfree.h',
@@ -181,7 +182,6 @@
                       'src/core/iomgr/alarm.h',
                       'src/core/iomgr/alarm_heap.h',
                       'src/core/iomgr/alarm_internal.h',
-                      'src/core/iomgr/block_annotate.h',
                       'src/core/iomgr/endpoint.h',
                       'src/core/iomgr/endpoint_pair.h',
                       'src/core/iomgr/fd_posix.h',
@@ -406,7 +406,8 @@
                       'src/core/census/operation.c',
                       'src/core/census/tracing.c'
 
-    ss.private_header_files = 'src/core/support/env.h',
+    ss.private_header_files = 'src/core/support/block_annotate.h',
+                              'src/core/support/env.h',
                               'src/core/support/file.h',
                               'src/core/support/murmur_hash.h',
                               'src/core/support/stack_lockfree.h',
@@ -462,7 +463,6 @@
                               'src/core/iomgr/alarm.h',
                               'src/core/iomgr/alarm_heap.h',
                               'src/core/iomgr/alarm_internal.h',
-                              'src/core/iomgr/block_annotate.h',
                               'src/core/iomgr/endpoint.h',
                               'src/core/iomgr/endpoint_pair.h',
                               'src/core/iomgr/fd_posix.h',