Use an AtomicLoad() macro in sqlite3HeapNearlyFull().

FossilOrigin-Name: 7556bc632e271d8a1e4fd836ce91e28213768ac09c90857b91171e9cd1009884

manifest

@@ -1,5 +1,5 @@
-C Yet\sanother\sattempt\sto\senhance\ssqlite3_load_extension()\sso\sthat\sit\sworks\nwith\sWindow-style\spathnames\susing\sa\sbackslash\sseparator\scharacter.
-D 2020-04-26T22:04:48.458
+C Use\san\sAtomicLoad()\smacro\sin\ssqlite3HeapNearlyFull().
+D 2020-04-28T11:45:41.489
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@@ -497,7 +497,7 @@ F src/insert.c 8e4211d04eb460c0694d486c6ba1c068d468c6f653c3f237869a802ad82854de
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-F src/malloc.c cabfef0d725e04c8abfe0231a556ed8b78bf329dcc3fddbf903f6cdcd53cf4e6
+F src/malloc.c 998984783063d4172bb11630ba586e6c6483ddfc8e24a9881a6f495128f23569
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
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 F src/mem2.c f1940d9e91948dd6a908fbb9ce3835c36b5d83c3
@@ -1861,7 +1861,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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manifest.uuid

@@ -1 +1 @@
-b73d9a7d6f7fec0ffc9640902a849289c305f8651e891388c01255c4da7a6c4b
+7556bc632e271d8a1e4fd836ce91e28213768ac09c90857b91171e9cd1009884

src/malloc.c

@@ -179,7 +179,7 @@ int sqlite3MallocInit(void){
 ** sqlite3_soft_heap_limit().
 */
 int sqlite3HeapNearlyFull(void){
-  return mem0.nearlyFull;
+  return AtomicLoad(&mem0.nearlyFull);
 }
 
 /*