Make the placement-new buffer in LazyInstance<Type> aligned.

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 587 matching lines @@
    fun:*OmniboxViewGtk16SetSelectedRange*
 }
 {
    bug_66941
    Memcheck:Leak
    ...
    fun:STAN_ChangeCertTrust
    fun:CERT_ChangeCertTrust
 }
 {
-   bug_64930 [vector-under-hashtable false positive leaks on x64]
-   Memcheck:Leak
-   ...
-   fun:_ZNSt6vector*
-   fun:_ZNSt6vector*
-   fun:_ZN9__gnu_cxx9hashtable*
-   fun:_ZN9__gnu_cxx9hashtable*
-   fun:_ZN9__gnu_cxx8hash_map*
-}
-{
    leaks in bash
    Memcheck:Leak
    ...
    obj:/bin/bash
 }
 {
    bug_73000_fixed_upstream_in_gtk
    Memcheck:Cond
    fun:clipboard_clipboard_buffer_received
    ...
@@ skipping 4321 matching lines @@
 }
 {
    bug_todo_getdelim2
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }