Revert "REVERT THIS: fix alignment to fix tests for now"

This reverts commit 1f325781bced4f6311462cf4e7682aa99ea34d0b.

src/core/lib/gprpp/memory.h

@@ -41,7 +41,7 @@
 namespace grpc_core {
 
 // The alignment of memory returned by gpr_malloc().
-constexpr size_t kAlignmentForDefaultAllocationInBytes = 16;
+constexpr size_t kAlignmentForDefaultAllocationInBytes = 8;
 
 // Alternative to new, since we cannot use it (for fear of libstdc++)
 template <typename T, typename... Args>