Consistent qualifier ordering.

Change our handful of `constexpr static`s to the much more common
`static constexpr`. It's easier to "follow existing style" when there
aren't two existing styles to copy from, and all else being equal,
"majority wins" :-)

Test: treehugger
Change-Id: Ifbf0f62ab84c9450bf9c2e49e96915c126fd20c4
diff --git a/tests/malloc_test.cpp b/tests/malloc_test.cpp
index 776643d..aa53450 100644
--- a/tests/malloc_test.cpp
+++ b/tests/malloc_test.cpp
@@ -824,7 +824,7 @@
     8, 32, 128, 4096, 32768, 131072, 1024000, 10240000, 20480000, 300000000
   };
 
-  constexpr static size_t kMaxAllocs = 50;
+  static constexpr size_t kMaxAllocs = 50;
 
   for (size_t size : sizes) {
     // If some of these allocations are stuck in a thread cache, then keep
@@ -867,7 +867,7 @@
   SKIP_WITH_HWASAN << "hwasan does not implement mallinfo2";
   static size_t sizes[] = {8, 32, 128, 4096, 32768, 131072, 1024000, 10240000, 20480000, 300000000};
 
-  constexpr static size_t kMaxAllocs = 50;
+  static constexpr size_t kMaxAllocs = 50;
 
   for (size_t size : sizes) {
     // If some of these allocations are stuck in a thread cache, then keep
diff --git a/tests/stdatomic_test.cpp b/tests/stdatomic_test.cpp
index 7b98df2..727af87 100644
--- a/tests/stdatomic_test.cpp
+++ b/tests/stdatomic_test.cpp
@@ -181,7 +181,7 @@
 
 // And a rudimentary test of acquire-release memory ordering:
 
-constexpr static uint_least32_t BIG = 30'000'000ul; // Assumed even below.
+static constexpr uint_least32_t BIG = 30'000'000ul;  // Assumed even below.
 
 struct three_atomics {
   atomic_uint_least32_t x;
diff --git a/tests/system_properties_test.cpp b/tests/system_properties_test.cpp
index aa8fef4..b1dfe0b 100644
--- a/tests/system_properties_test.cpp
+++ b/tests/system_properties_test.cpp
@@ -498,7 +498,7 @@
     check_with_read_callback(name, value);
   }
 
-  constexpr static const char* kExtraLongLegacyError =
+  static constexpr const char* kExtraLongLegacyError =
       "Must use __system_property_read_callback() to read";
   for (const auto& property : long_properties) {
     const std::string& name = property.first;