Initialize Volatile value (#74959)

src/coreclr/gc/env/volatile.h

@@ -302,9 +302,9 @@ private:
 
 public:
     //
-    // Default constructor.  Results in an uninitialized value!
+    // Default constructor.
     //
-    inline Volatile()
+    inline Volatile() : m_val {}
     {
     }
 

src/coreclr/inc/volatile.h

@@ -342,9 +342,9 @@ private:
 
 public:
     //
-    // Default constructor.  Results in an uninitialized value!
+    // Default constructor.
     //
-    inline Volatile()
+    inline Volatile() : m_val {}
     {
         STATIC_CONTRACT_SUPPORTS_DAC;
     }

src/tests/issues.targets

@@ -562,12 +562,6 @@
         <ExcludeList Include="$(XunitTestBinBase)/Regressions/coreclr/GitHub_45929/test45929/*">
             <Issue>https://github.com/dotnet/runtime/issues/60152</Issue>
         </ExcludeList>
-        <ExcludeList Include="$(XunitTestBinBase)/GC/API/GC/GetTotalPauseDuration/*">
-            <Issue>https://github.com/dotnet/runtime/issues/74631</Issue>
-        </ExcludeList>
-        <ExcludeList Include="$(XunitTestBinBase)/GC/API/GC/GetGCMemoryInfo/*">
-            <Issue>https://github.com/dotnet/runtime/issues/74902</Issue>
-        </ExcludeList>    
     </ItemGroup>
 
     <!-- The following are x64 Unix failures on CoreCLR. -->