[lldb] Fix failure in TestStackCoreScriptedProcess on x86_64

This patch should address the failure of TestStackCoreScriptedProcess
that is happening specifically on x86_64.

It turns out that in 1370a1c, I changed the way we extract integers
from a `StructuredData::Dictionary` and in order to get a stop info from
the scripted process, we call a method that returns a `SBStructuredData`
containing the stop reason data.

TestStackCoreScriptedProcess` was failing specifically on x86_64 because
the stop info dictionary contains the signal number, that the `Scripted
Thread` was trying to extract as a signed integer where it was actually
parsed as an unsigned integer. That caused `GetValueForKeyAsInteger` to
return the default value parameter, `LLDB_INVALID_SIGNAL_NUMBER`.

This patch address the issue by extracting the signal number with the
appropriate type and re-enables the test.

Signed-off-by: Med Ismail Bennani <[email protected]>

Author: medismailben

lldb/include/lldb/Utility/StructuredData.h

@@ -484,6 +484,7 @@ class StructuredData {
       }
       return success;
     }
+      
     template <class IntType>
     bool GetValueForKeyAsInteger(llvm::StringRef key, IntType &result) const {
       ObjectSP value_sp = GetValueForKey(key);

lldb/source/Plugins/Process/scripted/ScriptedThread.cpp

@@ -249,10 +249,12 @@ bool ScriptedThread::CalculateStopInfo() {
         StopInfo::CreateStopReasonWithBreakpointSiteID(*this, break_id);
   } break;
   case lldb::eStopReasonSignal: {
-    int signal;
+    unsigned int signal;
     llvm::StringRef description;
-    data_dict->GetValueForKeyAsInteger("signal", signal,
-                                       LLDB_INVALID_SIGNAL_NUMBER);
+    if (!data_dict->GetValueForKeyAsInteger("signal", signal)) {
+        signal = LLDB_INVALID_SIGNAL_NUMBER;
+        return false;
+    }
     data_dict->GetValueForKeyAsString("desc", description);
     stop_info_sp =
         StopInfo::CreateStopReasonWithSignal(*this, signal, description.data());